In
light-frame construction, a trimmer is a timber or metal beam (joist) used to create an opening around a stairwell, skylight, chimney, and the like. Trimmers are installed parallel to the primary floor or ceiling joists and support
headers, which run perpendicular to the primary joists.
It can also refer to a
jack stud that supports a header above a window or door opening.
Traditionally, a stud which was less than full length was sometimes referred to as a
cripple
A cripple is a person or animal with a physical disability, particularly one who is unable to walk because of an injury or illness. The word was recorded as early as 950 AD, and derives from the Proto-Germanic ''krupilaz''. The German and Dutch w ...
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Building a Wall 3 - Three Stud Corner and Windows , DoItYourself.com
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References
Structural system
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